22-1x, WX30, 1922 U.S. National Christmas Seals Sheet, SqBg, F, No Gum. Never folded, shipped flat.
Issued 1922 by the National Tuberculosis Association (NTA). Designed by Thomas M. Cleland. Image of a mother and child. Typographed by Eureka Specialty Printing Co., blue, red, and yellow. Sheet of 100 (10x10), SE4S, seal size 19x23mm; perf. 121/2, SqBg.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.